Hello everyone : )
I have been following the 'Making a tyre' tutorial and I'm getting stuck at the FLOW stage.
Please have a look at the screen shots. I have two queries;

Why does my tyre tread design crowd together when I use flow?
Why is my tyre named 'Joined Surface' and not just 'Surface' like in the tutorial? Could this be where the problem lies?

I look forward to your help.
Cheers.

Sandeep.